Dr. Naresh Thadhani
Naresh Thadhani is Professor and Chair of the School of Materials Science and Engineering at Georgia Tech (GT). He joined the GT faculty in 1992, after six-years in the Center for Explosives Technology Research at New Mexico Tech, and two years as a post-doc at CalTech. He received his B.E. in 1980 from the Malaviya National Institute of Technology in Jaipur, India, M.S. from South Dakota School of Mines, and Ph.D. from New Mexico Tech, all in Metallurgical Engineering.
Dr. Thadhani’s research focusses on the fundamental mechanisms of physical, chemical, and mechanical changes under high-pressure shock-compression, and the deformation and fracture response of metals, ceramics, polymers, and composites subjected to ballistic impact and high-strain-rate loading. He has led significant advancements in the understanding of shock-induced phase transformations and mechanical properties of bulk metallic glasses; design, development, and characterization of structural energetic materials, and the shock-compression response of highly heterogeneous (granular) materials through meso-scale computational simulations and experimental studies using novel optomechanical pressure sensors and interferometry approaches.
At Georgia Tech, he has developed a state-of-the-art high-strain-rate laboratory which includes 80-mm and 7.62-mm diameter single-stage gas-guns, and a laser-accelerated thin-foil set-up, to perform impact experiments at velocities of 70 to 1200 m/s. The experiments employ time-resolved diagnostics to monitor shock-initiated events with nanosecond resolution employing piezoelectric and piezoresistive stress gauges, multi-beam VISAR interferometry, multiplexed Photonic-Doppler-Velocimetry, and high-speed digital imaging, optomehcanical spectral sensors, combined with the ability to recover impacted materials for post-mortem microstructural characterization and determination of other properties. He also has computational capabilities employing continuum simulations for design of experiments and development and validation of constitutive equations, as well as for meso-scale discrete particle numerical analysis (using CTH and ALE3D codes) to determine the effects observed during shock compression of heterogeneous materials.
Dr. Thadhani has advised 15 visiting scientists/post-docs; 26 Ph.D and 18 M.S degree students; and mentored 50+ undergraduate researchers. His current group includes 6 Ph.D. students, 1 Research Engineer, and 4 undergraduate research assistants. He has attracted research funding exceeding ~$20M from federal agencies including the AFOSR, ARO, DARPA, DTRA, ONR, NSF, as well as from several national DoE and DoD laboratories and industries. He has co-edited 12 books/proceedings, published more than 170 paper papers in refereed journals (including several invited review articles) and 150 in conference proceedings, and presented more than 150 invited talks/seminars. He has served or is serving on review boards including the National Academy of Science panel at the Army Research Laboratory (2015, 2016, and 2018), and academic program reviews at Penn State University, Universities of Texas at Austin, Dallas, and at El Paso, University of Notre Dame, University of Florida, University of Central Florida, and the University of California multi-campus national lab collaborative research program review.
Dr. Thadhani is recipient of 2018 TMS Leadership award, Fellow of ASM International and American Physical Society, and Academician of EuroMediterranean Academy of Arts and Sciences.
Research Scientist II
Dr. Greg Kennedy
Dr. Kennedy is our Research Scientist II and go-to-guy. He received his M.S. from Georgia Tech in Materials Science and Engineering, and his Ph.D. from Kumamoto University in New Frontier Sciences. He is a outdoorsman and avid bicyclist.
Travis J. Voorhees
Travis is in the final stages of completing a PhD in Materials Science and Engineering. He uses the 80 mm light gas gun in the High Strain Rate Laboratory to shock compress CeO2 powders to densities within the incomplete compaction range, i.e., to pressures below crush strength. The Hugoniot data collected from these experiments are used to develop and calibrate compaction models for continuum-level free-Lagrangian FVM simulations of CeO2 powder under complex multiaxial shock loading.
Travis is a fellow of the Krell Institute’s DOE NNSA LRGF and spends his summers in the Applied Theoretical Physics divison at Los Alamos National Laboratory working with the PHELIX and Proton Radiography teams to conduct and simulate magnetohydrodynamically driven liner implosion experiments on CeO2 powder with in situ proton radiography.
Katie studies the effect of shock and high strain rates on dislocation interactions in additively manufactured metals, with a focus on Stainless Steel 316L. She is interested in the manipulation of micro-structure through additive manufacturing to create metals with superior high strain rate deformation responses compared to traditionally processed metals. Utilization of in-situ TEM to characterize dislocation movement during strain as well as analysis of post-shocked samples can help to characterize the unique response of additively manufactured micro-structures to shock environments.
Andrew Boddorff is currently a third year Ph.D. candidate in the Material Science and Engineering School at Georgia Tech. After graduating from Hamilton College in 2010 with a degree in Chemistry, Andrew joined DC Teaching Fellows to become an educator and enter the classroom with the intent of serving the vulnerable student populations in the nation’s capital. Andrew joined the faculty at Ballou SHS and worked for five years as a Chemistry teacher and eventual department chair.
The love of science that he passed onto his students eventually lead him to return to the lab, joining Dr. Thadhani’s group. His thesis centers around understanding how the heterogeneities present in additively manufactured materials affect shock properties through gas gun experiments. Andrew is a NASA Pathways Intern and will continue work on additive manufacturing of metal's work that he started this past summer in Fall '19. Beyond the lab, Andrew enjoys physical activities such as hiking and Ultimate Frisbee as well as cerebral pass times, such as board games.
Karla Wagner is a third year Ph.D. student in Materials Science and Engineering in Dr. Thadhani's group. She graduated from Georgia Tech with her BS in MSE in December 2016, where she was a member of the marching band and served the community through Tau Beta Sigma. She has worked largely in the aerospace field, focusing on engineering composites while interning at Gulfstream, Boeing, and SpaceWorks Enterprises. Karla's research is currently focused on understanding the dynamic response of highly heterogeneous 3D printed particle composites and developing quantum dots as mesoscale optical sensors for use in high strain rate work.
Karla is an active mentor to undergraduates through the MSE Industry-Student Mentoring Program, after being mentored herself as an undergraduate at Georgia Tech. She is also involved in the review and judging of both PURA and capston research projects and is a task group leader in GSAG. She has been recognized by receiving the FLAMEL Fellowship through Georgia Tech, funded by the IGERT award. In her spare time, Karla enjoys playing the oboe, reading, and skiing, and loves her pet rats and fish.
Sukanya M. Sharma
Sukanya Sharma is a third-year PhD student in Materials Science and Engineering at Georgia Tech. She completed her BE in Mechanical Engineering at Manipal Institute of Technology in India. Her research interests lie in the field of Damage and fracture of materials. Sharma is primarily interested in the science of fracture and in the development of stronger and safer materials for the future. She is co-advised by Dr. Naresh Thadhani amd Dr. Arun Gokhale to understand the fracture mechanism of Advanced High strength steels under dynamic loading for automotive applications.
Sharma is a part of the Graduate Student Organization and also mentors undergraduate students. In her spare time, she enjoys reading novels, travelling, swimming and cooking.
Keara Frawley is a second-year PhD student in Materials Science and Engineering at Georgia Tech. She received a BSE in Materials Science and Engineering and a BA in German Studies from the University of Connecticut in 2018. She is working with Dr. Naresh Thadhani and Dr. Rampi Ramprasad to use gas gun experiments and molecular dynamics simulations to study the behavior of polyethylene under high strain rates and pressures.
Keara is a National Defense Science and Engineering Graduate (NDSEG) fellow and is also a recipient of the President’s Fellowship through Georgia Tech. She is currently the secretary of the Materials Research Society (MRS) Georgia Tech chapter.
Sungwoo Jang is a post-doc researcher in Materials Science and Engineering in Dr. Thadhani's group. He graduated from Chung-Ang University in South Korea with his PhD in Mechanical Engineering. His research interests include the integrated design of materials and products in complex engineering systems across multiple scales. His research is currently focused on process optimization for additive manufacturing of energetic materials and investigation of material behavior under high strain rate.
Justin Steiner is a fourth year undergraduate Materials Science and Engineering major at the Georgia Institute of Technology. He joined the Thadhani group as an Undergraduate Research Assistant in the Fall 2016 semester and has been working with the group since. He is mainly under the advisement of Travis Voorhees and Greg Kennedy. Justin helps with various tasks around the lab such as machining projectiles, taking accuracy measurements, prepping the 80mm air gun, 3D modeling and water-jetting parts, and helping set up laser velocimetry instrumentation.
Outside of the lab Justin is in a fraternity, actively involved in Outdoor Recreation Georgia Tech (ORGT) Backpacking, and supports multiple campus outreach programs. Justin loves to travel and backpack, with the most recent trip being a through hike of the 133-mile GR20 trail in Corsica, France. Justin is a Marine Corps Officer Candidate and will be commissioning as a Second Lieutenant after completing Officer Candidate School.
Dong June Jang
Ananya Jain is a Materials Science and Engineering student at Georgia Tech and is from Kashmir, India. She joined the Thadhani lab in her first year and is jointly advised by Dr. Thadhani and Karla Wagner. Her latest experiments are geared toward characterizing Perovskite Quantum Dots with the overarching goal of using them as mesoscale pressure sensors based on their tunability and response features. She also assists with scanning and imaging profiles of 3D-printed structures using computational methods and works with the MicroCT, laser, and big and small high-strain gas guns.
Outside the lab, you will find Ananya working on her Private Pilot’s License, chasing squirrels, and hunting down new art galleries to get lost in. She also likes to keep a close watch on the medical field, travelling to Guatemala and India to help doctors there. Mostly, however, she is seen enjoying a hearty laugh with her friends with her practical jokes!